Draw audio feature bar charts

Started work on drawing the bar charts for audio features.

spotifyvis/admin.py

@@ -1,3 +1,8 @@
 from django.contrib import admin
+from .models import Track, Artist, AudioFeatures, User
 
 # Register your models here.
+admin.site.register(Track)
+admin.site.register(Artist)
+admin.site.register(AudioFeatures)
+admin.site.register(User)

spotifyvis/models.py

@@ -51,10 +51,14 @@ class Track(models.Model):
     runtime = models.PositiveSmallIntegerField()
     name = models.CharField(max_length=150)
     users = models.ManyToManyField(User, blank=True)
-    genre = models.CharField(max_length=30)
+    genre = models.CharField(max_length=30, default="")
 
     def __str__(self):
-        return self.name 
+        track_str = "{}, genre: {}, artists: [".format(self.name, self.genre)
+        for artist in self.artists.all():
+            track_str += "{}, ".format(artist.name)
+        track_str += "]"
+        return track_str
 
 #  }}} Track # 
 

spotifyvis/static/spotifyvis/scripts/user_data.js

@@ -2,8 +2,9 @@
  * Retrieves data for a specific audio feature for a certain user
  * @param audioFeature: the audio feature for which data will be retrieved
  * @param clientSecret: the client secret, needed for security
+ * @param chartElement: the SVG element in which the data will be plotted
  */
-function getAudioFeatureData(audioFeature, userSecret) {
+function plotAudioFeatureData(audioFeature, userSecret, chartElement) {
     let httpRequest = new XMLHttpRequest();
     /*
      * Handler for the response
@@ -12,10 +13,7 @@ function getAudioFeatureData(audioFeature, userSecret) {
         if (httpRequest.readyState === XMLHttpRequest.DONE) {
             if (httpRequest.status === 200) {
                 let responseData = JSON.parse(httpRequest.responseText);
-                // TODO: The data points need to be plotted instead
-                for (let data of responseData.data_points) {
-                    console.log(data);
-                }
+
             } else {
                 alert("There was a problem with the login request, please try again!");
             }

spotifyvis/templates/spotifyvis/user_data.html

@@ -16,10 +16,71 @@
             <p class="browsehappy">You are using an <strong>outdated</strong> browser. Please <a href="#">upgrade your browser</a> to improve your experience.</p>
         <![endif]-->
         <p>Logged in as {{ id }}</p>
+        <script src="https://d3js.org/d3.v5.js"></script>
         <script src="{% static "spotifyvis/scripts/user_data.js" %}"></script>
         <script>
             sessionStorage.setItem('user_secret', "{{ user_secret }}");
-            getAudioFeatureData('instrumentalness', sessionStorage.getItem('user_secret'));
+            let width = 480, height = 300;
+
+            let instrumData = {
+                "0-0.25": 0,
+                "0.25-0.5": 0,
+                "0.5-0.75": 0,
+                "0.75-1.0": 0,
+            };
+            // define the vertical scaling function
+            let vScale = d3.scaleLinear().range([height, 0]);
+
+            // getAudioFeatureData('instrumentalness', sessionStorage.getItem('user_secret'));
+            d3.json("{% url 'get_audio_feature_data' audio_feature='instrumentalness' client_secret=user_secret %}")
+                .then(function(response) {
+                for (let dataPoint of response.data_points) {
+                    dataPoint = parseFloat(dataPoint);
+                    if (dataPoint > 0.75) {
+                        instrumData["0.75-1.0"] += 1;
+                    } else if (dataPoint > 0.5) {
+                        instrumData["0.5-0.75"] += 1;
+                    } else if (dataPoint > 0.25) {
+                        instrumData["0.25-0.5"] += 1;
+                    } else {
+                        instrumData["0-0.25"] += 1;
+                    }
+                }
+
+                let dataSet = Object.values(instrumData);
+                let dataRanges = Object.keys(instrumData); // Ranges of audio features, e.g. 0-0.25, 0.25-0.5, etc
+                let dataArr = [];
+                // turn the counts into an array of objects, e.g. {range: "0-0.25", counts: 5}
+                for (let i = 0; i < dataRanges.length; i++) {
+                    dataArr.push({
+                        range: dataRanges[i],
+                        counts: instrumData[dataRanges[i]]
+                    });
+                }
+                vScale.domain([0, d3.max(dataSet)]);
+
+                let hScale = d3.scaleBand().domain(dataRanges).rangeRound([0, width]);
+
+                let barWidth = width / dataSet.length;
+
+                let instrumSVG = d3.select('body')
+                    .append('svg').attr('width', width).attr('height', height);
+
+                let xAxis = d3.axisBottom().scale(hScale);
+                let yAxis = d3.axisLeft().scale(vScale);
+
+                let instrumBar = instrumSVG.selectAll('g')
+                    .data(dataArr)
+                    .enter().append('g')
+                    .attr("transform", function(d) { return "translate(" + hScale(d.range) + ",0)"; });
+
+                instrumBar.append('rect')
+                    .attr('y', function(d) { return vScale(d.counts); })
+                    .attr("height", function(d) { return height - vScale(d.counts); })
+                    .attr("width", function(d) { return hScale(d.range); });
+            });
+
+
         </script>
     </body>
 </html>

spotifyvis/utils.py

@@ -401,9 +401,8 @@ def get_artists_in_genre(user, genre):
     :returns: dict of artists in the genre along with the number of songs they
     have. 
     """
-    artist_counts = (Artist.objects.filter(track__users=user)
-            .filter(track__genre=genre) 
-            #  .annotate(num_songs=Count('track', filter=Q(track__genre=genre)))
+    artist_counts = (Artist.objects.filter(track__users=user).distinct()
+                     .filter(track__genre=genre).distinct()
                      .annotate(num_songs=Count('track'))
                      )
     processed_artist_counts = [{'name': artist.name, 'num_songs': artist.num_songs} for artist in artist_counts]

spotifyvis/views.py

@@ -165,7 +165,7 @@ def test_db(request):
     """TODO
     """
     #  user_id = "polarbier"
-    user_id = "35kxo00qqo9pd1comj6ylxjq7"
+    user_id = "chrisshyi13"
     context = {
         'user_secret': User.objects.get(user_id=user_id).user_secret,
     }